Some people will pay for books for PD books if the seller offers added value, such as cleaning up the OCR errors, putting in the original pictures, putting in the cover, or offering an interactive table of contents.
Others will decide that they can live with the occasional OCR error, and stick with the Project Gutenberg version.
I don't like the scanned PDF versions at all. They are very hard to read. I'm in the process of converting a scanned PDF file into a text file, and it is a lot of work. I ran it through an OCR program but there are a lot of errors. I go through it, comparing the PDF with the OCR version to figure out what the text is supposed to be. I work on it now and then when I get a little bit of time. It's a quite obscure book on sports history that might be of interest to some.
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